Cylinder head construction



May 3%, 19. E. GINN ETAL CYLINDER HEAD CONSTRUCTION Original Filed April 9,1942 2 Sheets-Sheet 1 30, E. GINN ETAL CYLINDER HEAD CONSTRUCTION Original Filed April 9, 1942 2 Sheets-Sheet 2 m 2% YkQfi H a /.j E f z V i J wkx Q 1 W a 1 v 0 1 1 4 m 3 I 3 'll Patented May 30, 1944 2,350,226 cvuumza new CONSTRUCTION Earl Ginn. North Muskegon, Harold Leslie Casselman. Muskegon,

and Dana A. Campbell,

Spring Lake, Mich., asslgnors to Continental Motors Corporation, Muskegon, Mich., a corporation of Virginia Original application April 9, 1942, Serial No. 438.244. Divided and this application February 1], 1943, Serial No. 475,518

Claims.

Our invention relates to an improved cylinder head construction and more especially to a cylinder head structure constructedfor cooperative assembly with the cylinder block of an over-head valve internal combustion engine.

This application is a division of our copending application for U. S. Letters Patent. Ser. No. 438,244, filed April 9, 1942, entitled Cylinder head and combustion chamber construction.

In this type of engine the combustion chambers are carried in the cylinder head structure and are arranged to over-lie the engine cylinders. In the present day high output engines it is necessary to employ large intake and exhaust valves and to provide as large a port area as is possible.

An object of our present invention is to construct an improved cylinder head structure by providing improved means which facilitate the assembly of the cylinder head with the engine block.

More particularly, we have provided a side reentrant portion or recess whereby to provide a flange and improved means for more readily securing said cylinder head flange to the cylinder block. Furthermore such a construction provides a spark plug assembly at the most preferable location in the engine combustion chamber. This recess or pocket lies intermediate the rocker box structure and the cylinder block top face and provides for easy access to the push rod structure, thereby facilitating manufacturing assembly and servicing of the engine.

Other objects of our present invention pertain to various structural details described and claimed in particular detail hereafter.

For a more detailed understanding of our invention, reference may be had to the accompanying drawings illustrating a preferred embodiment of our invention, wherein like figures refer to like parts throughout the several views and in which: h

Fig. 1 is a bottom plan view of the cylinder head structure embodying our invention, and

Figs. 2, 3 and 4 are detail transverse sectional views through the cylinder head structure taken substantially on the lines 2-2, 3-3 and 4-4 respectively in Fig. 1.

The cylinder head structure herein illustrated by these several figures provides improved engine performance, and said head structure is pref erably formed of a casting A which may be bolted inlthe usual manner to an engine cylinder block B by means of suitable bolts. The preferred construction embodies a structure overwith combustion chambers ll cooperatively associated with each of the engine cylinders. The cylinderhead is provided with intake and exhaust passages l2 and I3 respectively terminating in intake and exhaust ports I4 and 15, as more particularly shown in Figs. 2 and 4. The said ports have valve seats l8,fltted therein, the one illustrated being the intake valve seat. An intake valve I1 is operable to control this intake port I! and it willbe seen that same opens inwardly of the combustion chamber and substantially axially inwardly of the cylinder Ill. The side walls and 2| of said combustion chamber are constructed somewhat spherical in contour thus providing immediately for a maximum clearance between the unseated valve heads 22 and the adjacent combustion chamber wall, said clearance being increased as the valve opens, to provide more space or area through which the gases may flowwlthout being restricted.

The upper portion of the cylinder structure is recessed as at 30, and the rocker arms are assembled in th s recess or pocket in a conventional manner, same being mounted on the conventional rocker arm shaft (not shown) supported in bearings which may be mounted on the bearing supports 3|. The floor 33 of this recess or pocket is sloped or inclined, as clearly shown in Figs. 2 to 4, to drain any oil accumulations to one side of the cylinder head. Preferably the low po nt of the floor 33 is in that region where the push rods- 34 are operable. The cylinder head is provided with suitable openings 35 which support a push rod housing 36 and the oil. accumulations are drained from the pocket or recess 30 into the push rod housing 36 and thence preferably into the oil return or scavenge l ne and subsequently into the crankcaseof the engine.

The cylinder head structure prov des a lateral inwardly recessed pocket 40 (see Fig. 3), which partially overlies the combustion chamber H and conveniently provides a spark plug pocket, the

. spark plug 46 being threaded into the tapped hole 4|. cylinder head is provided with a flange or ledge 42 overlying the cylinder and a bolt 43 is threaded through a hole 44 in the ledge and secured to the engine block. The pocket 40 hereby provides a recess permitting easy access to be had to the head 45 of bolt 43 and to the spark plug 46.

The recessed pocket 40 lies preferably immediately below the rocker arm bearing supports 3| and the rocker arm push rod housings 38 exlying a plurality of cylinders l0 and is provided .tend downwardly through this pocket. On re- Immediately below the pocket 40, themoval of the push rod, these housings 36 can be readily removed from the pocket 40.

It will be noted that this particular construction facilitates the cylinder head assembly with the engine block B, and as well, provides for ready manufacturing assembly and servicing of the valve actuating mechanism, more particularly the push rod assembly.

It will be observed that the cylinder head structure herein illustrated facilitates economical engine manufacture and furthermore functions i:- provide for improved engine performance.

Although we have illustrated but one form of our invention and have described-in detail but a single application thereof, it will be apparent to those skilled in the art to which our invention pertains, that various modifications and changes may be made therein without departing from the spirit of our invention or from the scope of the appended claims.

We claim:

l. A cylinder head structure for an interim combustion engine having a cylinder and comprising a structure having an engine combustion chamber and a rocker box portion extending transversely for substantially the full width of the cylinder head structure, said structure provided with a laterally recessed portion adjacent said combustion chamber and underlying said rocker box portion. a spark plug opening extend- 30 ing through the wall directly separating the recessed portion from said combustion chamber, and a ledge lyin'g directly below said spark plug opening and overlying the cylinder block, and cylinder head bolts securing said ledge to the cylinder structure, said rocker box portion recessed portion and combustion chamber axially overlying the engine cylinder.

2. A cylinder head structure for an internal combustion engine having a cylinder and comprising a structure having an engine combustion chamber and a rocker box portion extending transversely for substantially the full width of the cylinder head structure, said structure provided with a laterally recessed portion adjacent said combustion chamber and overlying a portion thereof and underlying said rocker box portion,-a spark plug opening extending through the wall directly separating the recessed portion from said combustion chamber, and a ledge lying directly below said spark plug opening and overlying the cylinder block, and cylinder head bolts securing said ledge to the cylinder structure, said rocker box portion, recessed portion and combustion chamber axially overlying the engine cylinder.

3. A cylinder head structure for an internal combustion engine having a cylinder and comprising a structure having an engine combustion chamber and a laterally recessed portion adjacent said combustion chamber and overlying a portion thereof, a spark plug opening extending through the wall directly separating the recessed portion from said combustion chamber, and a ledge lying directly below said spark plug open- 2,aso,22e I a ing and overlying the cylinder block, and cylinder head bolts securing said ledge to the cylinder structure, said cylinder head having a rocker arm chamber overlying said entire combustion chamber and extending transversely for substantially the full width of the cylinder head structure and overlying said ledge, said recessed portion extending inwardly underneath said rocker arm chamber, said rocker box portion, recessed porlO tion and combustion chamber extending substantially normal to the engine cylinder axis and axially overlying saidengine cylinder.

4. A cylinder head structure for an internal combustion engine having a cylinder and com- 1 prising a structure having an engine combustion chamber and a laterally recessed portion adjaoent said combustion chamberand overlying a portion thereof, a spark plug opening extending through the wall directly separating the recessed o portion from said combustion chamber, and a ledge lying directly below said spark plug opening and overlying the cylinder block, and cylinder head bolts securing said ledge to the cylinder structure, said cylinder head having a rocker arm chamber extending substantially normal to the engine cylinder and extending transversely for substantially the full width of the cylinder head structure and overlying said ledge, saidlrecessed portion extending inwardly underneath said rocker arm chamber, said ledge being of greater thickness adjacent the combustion chamber, the ledge portion aforesaid having a cooling jacket portion constructed to underlie the spark plug and cool the combustion chamber wall in the vicinity of the spark plug and means connecting said jacket portion with the cylinder jacket.

5. A cylinder head structure for an internal combustion engine comprising a structure having an engine combustion chamber and a laterally 4o recessed portion adjacent said combustion chamber and overlying a portion thereof, a spark plug opening extending through the wall directly separating the recessed portion from said combustion chamber, and a ledge lying directly below said spark plug opening and overlying the cylinder block, and cylinder head bolts securing said ledge to the cylinder structure, said cylinder head having a rocker arm chamber, said recessed portion extending inwardly underneath said rocker arm chamber, said ledge being of greater thickness adjacent the combustion chamber, the

ledge portion aforesaid having a cooling Jacket portion and means connecting said jacket portion with the cylinder Jacket, said means located substantially immediately below the spark plug, said means and jacket portion underlying the spark plug and serving to uniformly cool the cylinder head portion in the vicinity of said plug, said jacket portion constructed in open communication with the remainder of said cylinder head coolant jacket.

EARL GINN. HAROLD LESLIE CASSELMAN. DANA .A. CAMPBELL. 

